Impact test - tests on stones, Civil Engineering

Assignment Help:

Impact Test:

Resistance of stones to impact is found by conducting tests in impacting testing machine .It contain of a frame with guides in which a metal hammer weighing 13.5 to15 kg may freely fall from a height of 380 mm.

913_impact testing machine.png

                  Aggregate impact testing machine

Aggregates of size 10 mm to 12.5 mm range are filled in cylinder in three equal layers; each layer being tamped 25 times. Similar is then transferred to the cup and again tamped 25 times. The hammer is then permitted to fall freely on the specimen 15 times. The specimen is then sieved throughout 2.36 mm sieve. Then,

674_impact testing machine1.png

Where           

 W2 = weight of fines

W1 = original weight.

The recommended impact values for several works are:

  • for wearing course >/30%
  • for bituminous mechadam >/35%
  • for water bound mechadam >/40%

Related Discussions:- Impact test - tests on stones

What is the liquidity index, A soil has a plastic limit of 25% and a plasti...

A soil has a plastic limit of 25% and a plasticity index of 30. If the natural water content of the soil is 34%, what is the liquidity index and what is the consistency index? H

Roofs, describe the general principle of roof design

describe the general principle of roof design

Plane table sureying, discuss the resection method of plane table sureying ...

discuss the resection method of plane table sureying in detail

Explain the cross sectional area of flow, Cross-sectional area of flow (ft ...

Cross-sectional area of flow (ft 2 ) (A) For rectangular channels = (w)(d). For trapezoidal channels, divide the flow area into two side triangles and one center rectangle, so

Resultant pull, two locomotive moving on opposite bank of a canal can pull ...

two locomotive moving on opposite bank of a canal can pull a vessal parallel to the banks by the means of two rope.the force in the ropes are 20kN and 24kN while the total angle be

Determine the governing effective length of a steel column, Determine the g...

Determine the governing effective length of a steel column? Determine the governing effective length of a W12 x 106 steel column that is 12' high, pinned at each end, and

Continuous prestressed concrete beam design , Assignment:-Continuous Prestr...

Assignment:-Continuous Prestressed Concrete Beam Design A cast in-place 3-span prestressed concrete T-beam is to be designed. The T-beam concsists of an 8-in thick reinforced

Float or slack of an activity is positive or negetive, 1. What take place w...

1. What take place when float or slack of an activity is positive Ans: It represents a situation where extra resources are available and the completion of the project is not de

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd